Subject:
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Re: Gray VS. Black Metroliner Nose
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Newsgroups:
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lugnet.trains
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Date:
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Fri, 2 Nov 2001 01:41:46 GMT
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Viewed:
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873 times
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> and I bet their operating temperature differential is higher, too, being
> stationary. That's the only way they can get more theoretical efficiency.
> Again, read up on Carnot cycle theory if you want to argue the point. Your
> theoretical maximum efficiency is upper bound by this ratio
I can ask, but I believe the info was 1050F x3 reheat stages, and 47.5%
overall.
Yes, they are all governed by Carnot cycle (diesel and steam both...)
> Rudolf Diesel knew that. He also knew of gas engine operating temperatures,
> and that's why he went with a cycle that injected fuel AFTER compression...
>
> so he could get higher operating temperatures.
Yep. So did Stirling, who had it even better, since his cycle with regenerator
is even better than Diesel...(and operates at a lower temp...the regenerator
gives a advantage here...since it is Stirling cycle, not Carnot...)
> > At 6%, fuel costs were lower than that of a diesel...mostly because coal • costs
> > less per BTU than diesel fuel...
>
> Today. But shifting technology on what may be a temporary differential may
> not be prudent, unless you are sure it's going to remain the same or move in
> the favorable direction.
Based on known reserves, and current rate of useage, there is ~300 years of
coal left, and ~30 of oil. Now, if I were a betting man, I think that I would
bet that coal prices are unlikely to rise as fast as oil prices...
James
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Message is in Reply To:
 | | Re: Gray VS. Black Metroliner Nose
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| (...) You can challenge it all you want. But you're not arguing with ME, you're arguing with thermodynamics. (unless you can show I've misapplied it) (...) and I bet their operating temperature differential is higher, too, being stationary. That's (...) (23 years ago, 1-Nov-01, to lugnet.trains)
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